MD Settings: polish up some top-level buttons

chrome/browser/resources/settings/search_engines_page/search_engines_page.html

 <link rel="import" href="chrome://resources/html/polymer_config.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://md-settings/search_engines_page/search_engines_browser_proxy.html">
 <link rel="import" href="chrome://md-settings/search_engines_page/search_engine_dialog.html">
 <link rel="import" href="chrome://md-settings/search_engines_page/search_engines_list.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="chrome://md-settings/web_ui_listener_behavior.html">
+<link rel="import" href="chrome://resources/html/action_link.html">
 
 <dom-module id="settings-search-engines-page">
   <template>
     <style include="settings-shared">
       .other-label-container {
         display: flex;
       }
 
       .other-label-container span {
         flex: 1;
       }
     </style>
     <div class="settings-box block">
       <settings-search-engines-list engines="[[defaultEngines]]">
       </settings-search-engines-list>
     </div>
     <div class="settings-box">
-      <paper-button class="link-button"
-          i18n-content="searchEnginesAddSearchEngine"
-          on-tap="onAddSearchEngineTap_" id="addSearchEngine"></paper-button>
+      <a is="action-link" i18n-content="searchEnginesAddSearchEngine"
+          on-tap="onAddSearchEngineTap_" id="addSearchEngine"></a>
     </div>
     <template is="dom-if" if="[[showAddSearchEngineDialog_]]" restamp>
       <settings-search-engine-dialog></settings-search-engine-dialog>
     </template>
     <div class="settings-box block">
       <div class="other-label-container">
         <span i18n-content="searchEnginesOther"></span>
         <cr-expand-button expanded="{{otherSearchEnginesExpanded_}}">
         </cr-expand-button>
       </div>
 
       <iron-collapse id="collapse" opened=[[otherSearchEnginesExpanded_]]>
         <settings-search-engines-list engines="[[otherEngines]]">
         </settings-search-engines-list>
       </iron-collapse>
     </div>
   </template>
   <script src="search_engines_page.js"></script>
 </dom-module>